CN110500141B - Sealing and ventilating structure - Google Patents
Sealing and ventilating structure Download PDFInfo
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- CN110500141B CN110500141B CN201910698329.2A CN201910698329A CN110500141B CN 110500141 B CN110500141 B CN 110500141B CN 201910698329 A CN201910698329 A CN 201910698329A CN 110500141 B CN110500141 B CN 110500141B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/10—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using sealing fluid, e.g. steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/28—Arrangement of seals
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a sealing and ventilating structure, which comprises: the turbine rotating shaft, the supporting bearing arranged on the turbine rotating shaft, the rear bearing seat connected to the combustion chamber casing, the sealing ventilation ring group arranged on the turbine rotating shaft and fixed with the rear bearing seat, the rotary table connected to the output end of the turbine rotating shaft, the sealing ring with one end connected with the rear bearing seat and the other end sleeved outside the rotary table to enclose an air outlet channel between the rear bearing seat and the rotary table, and the pressure regulating and exhausting device. The sealing and ventilating ring set is positioned in the sealing ring, the end face of the sealing and ventilating ring set abuts against the end face of the rear bearing seat, and the sealing and ventilating ring set is communicated with a high-pressure airflow flow passage and an airflow passage in the rear bearing seat. The sealing ventilation ring set is also communicated with the pressure-regulating exhaust device so as to regulate the pressure difference on two sides of the sealing ventilation ring set under the action of the pressure-regulating exhaust device, so that high-pressure airflow enters the pressure-regulating exhaust device from the airflow channel through the sealing ventilation ring set to form sealing circulation, and then two sealing structures coaxially arranged in the sealing ventilation ring set form two air sealing structures.
Description
Technical Field
The invention relates to the field of aircraft engines, in particular to a sealing and ventilating structure.
Background
A gap is formed between each rotor and each stator of the aero-engine, pressure lubricating oil for lubricating the bearing can be leaked from the gap, the lubricating condition of the bearing is further deteriorated, the consumption of the lubricating oil is increased, and a sealing device is arranged inside the aero-engine to guarantee the reliability of long-term operation of the aero-engine. In the existing propeller type aero-engine, a sealing device is arranged at a rear bearing seat of a combustion chamber casing to seal pressure lubricating oil for lubricating a bearing, and the pressure lubricating oil is prevented from leaking into an airflow channel to control the consumption of the lubricating oil. The sealing device is a single-channel sealing structure, and the sealing pressure can not be adjusted, so that the sealing effect is poor, the effects of blocking lubricating oil and preventing leakage can not be achieved, the sealing structure is complex, the installation and centering are difficult, the eccentric, eccentric and abnormal sound of the sealing position can be caused, and the normal use requirement of an engine can not be met.
Disclosure of Invention
The invention provides a sealing and ventilating structure, which aims to solve the technical problems that the existing sealing device is poor in sealing effect, the sealing pressure cannot be adjusted, and the effects of blocking lubricating oil and preventing leakage cannot be achieved.
The technical scheme adopted by the invention is as follows:
a sealed vent structure comprising: the turbine rotating shaft, the supporting bearing arranged on the turbine rotating shaft, the rear bearing seat connected to the combustion chamber casing and used for mounting the supporting bearing, the sealing and ventilating ring set arranged on the turbine rotating shaft and fixed with the rear bearing seat, the rotary table connected to the output end of the turbine rotating shaft, the sealing ring with one end connected with the rear bearing seat and the other end sleeved outside the rotary table so as to form an annular air flow channel between the rear bearing seat and the rotary table, and the pressure regulating and exhausting device used for regulating pressure and exhausting; the sealing and ventilating ring group is positioned in the sealing ring, the end face of the sealing and ventilating ring group abuts against the end face of the rear bearing seat, and the sealing and ventilating ring group is communicated with a high-pressure airflow channel and an airflow channel in the rear bearing seat so as to introduce high-pressure airflow in the high-pressure airflow channel into the airflow channel; the sealing ventilation ring group is also communicated with the pressure-regulating exhaust device to regulate the pressure difference on two sides of the sealing ventilation ring group under the action of the pressure-regulating exhaust device, so that high-pressure airflow enters the pressure-regulating exhaust device from the airflow channel through the sealing ventilation ring group to form sealing circulation, and further two coaxially arranged sealing structures in the sealing ventilation ring group form a sealing structure to hermetically install an outlet of a bearing installation cavity for supporting a bearing, so that the bearing installation cavity is prevented from being communicated with the airflow channel.
Furthermore, the sealing and ventilating ring group comprises a first sealing ring, a second sealing ring, a first comb tooth ring matched with the first sealing ring and a second comb tooth ring matched with the second sealing ring; the first grate tooth ring and the second grate tooth ring are arranged on the turbine rotating shaft along the axial direction, the second grate tooth ring is partially sleeved outside the first grate tooth ring, the first end of the first grate tooth ring props against the supporting bearing, the second end of the first grate tooth ring props against the first end of the second grate tooth ring, and the second end of the second grate tooth ring props against a mounting flange which is used for mounting the rotary table and arranged on the turbine rotating shaft; first ring cover of obturating is located first comb ring gear and the terminal surface supports the terminal surface that leans on the rear axle bearing, and first ring of obturating is used for forming first airtight structure with first comb ring gear, and the ring of obturating of second and first ring coaxial setting of obturating just link to each other in order to form the pressure regulating chamber with pressure regulating exhaust apparatus intercommunication between the two, and pressure regulating chamber and air flow channel and bearing installation cavity intercommunication, the ring of obturating of second are used for forming second way gas seal structure with the second comb ring gear.
Further, the first sealing ring comprises a hollow cylindrical first sealing barrel and a first mounting disc which is connected with the outer annular wall of the first sealing barrel and is annular, the first mounting disc is clamped in a stopping groove on the end face of the rear bearing seat, and the first sealing barrel is sleeved on the first comb tooth ring; the second sealing ring comprises a hollow cylindrical second sealing barrel and a second mounting disc which is connected with the outer annular wall of the second sealing barrel and is annular, the end face of the second mounting disc is fixedly connected with the end face of the first mounting disc to form a pressure regulating cavity between the second sealing barrel and the first mounting disc, and the second sealing barrel is sleeved outside the first sealing barrel and sleeved on the second comb tooth ring.
Furthermore, the inner walls of the first sealing cylinder and the second sealing cylinder are provided with spiral grooves extending along the axial direction in a turning mode and then are knurled; and graphite coatings are coated on the inner walls of the first sealing cylinder and the second sealing cylinder.
Furthermore, the gap between the graphite coating on the first sealing cylinder and the outer ring surface of the first labyrinth ring is 0.05-0.095 mm; the clearance between the graphite coating on the second sealing cylinder and the outer ring surface of the second labyrinth ring is 0.05 mm-0.095 mm.
Furthermore, a plurality of through holes and communication holes are formed in the first mounting plate; the plurality of through holes are respectively matched with the plurality of mounting holes on the end surface of the rear bearing seat, and the sealed ventilation ring group is detachably connected with the rear bearing seat through a connecting piece penetrating through the through holes and the correspondingly arranged mounting holes; the plurality of communication holes are respectively arranged corresponding to the plurality of vent holes on the end surface of the rear bearing seat, so that high-pressure air flow in the high-pressure air flow channel enters the air flow channel after passing through the vent holes and the communication holes.
Further, the through holes are uniformly arranged at intervals along the circumferential direction of the first mounting plate; the plurality of communication holes are uniformly arranged at intervals along the circumferential direction of the first mounting disc, the through holes and the communication holes are positioned on the same circle of the first mounting disc, and the through holes and the communication holes are distributed in a staggered mode.
Furthermore, a plurality of through pulling holes are further formed in the first mounting disc and are uniformly distributed at intervals along the circumferential direction of the first mounting disc.
Furthermore, an inwards concave and arc-shaped air storage groove is formed in the abutting surface of the first mounting plate, which faces the rear bearing seat, and a plurality of air exhaust holes penetrating through the first mounting plate are formed in the bottom of the air storage groove; the air storage groove is communicated with the pressure regulating exhaust device, the exhaust hole is communicated with the pressure regulating cavity, so that the sealed air flow in the pressure regulating cavity enters the pressure regulating exhaust device to be discharged after passing through the exhaust hole and the air storage groove, and the pressure of the sealed air flow in the pressure regulating cavity is regulated by the pressure regulating exhaust device.
Further, the pressure regulating and exhausting device comprises a guide pipe communicated with the air storage tank, a replaceable pressure regulating pad communicated with the guide pipe, an exhaust pipe communicated with a pressure regulating hole in the pressure regulating pad, and an exhaust component communicated with the exhaust pipe to exhaust airflow in the exhaust pipe outwards; the pressure regulating pad is detachably arranged in a pressure regulating port of the combustion chamber casing.
The invention has the following beneficial effects:
in the sealing and ventilating structure, the pressure difference between two sides of the sealing and ventilating ring set is adjusted by arranging the pressure adjusting and exhausting device, so that high-pressure airflow enters the pressure adjusting and exhausting device from the airflow channel through the sealing and ventilating ring set to form sealed circulation, and further two coaxially arranged sealing structures in the sealing and ventilating ring set form two airtight structures, the sealing effect of the sealing and ventilating ring set is enhanced, and the purposes of blocking lubricating oil in a bearing installation cavity and preventing the lubricating oil from leaking into the airflow channel are achieved; the pressure difference between the two sides of the sealed ventilating ring group can be adjusted through the pressure adjusting and exhausting device, so that the pressure of a bearing installation cavity between the sealed ventilating ring group and the supporting bearing can be adjusted, the phenomenon that too large sealed airflow pressure in the bearing installation cavity easily causes excessive foam in lubricating oil in a turbine shaft cavity and the bearing installation cavity and blows off a lubricating oil film at the supporting bearing is avoided, and meanwhile, the phenomenon that too small sealed airflow pressure in the bearing installation cavity causes too large pressure difference between the two sides of the sealed ventilating ring group is avoided, so that the sealing effect of the sealed ventilating ring group is influenced; the sealing and ventilating structure has simple structure and good effect, and ensures the air pressure difference at the front side and the rear side of the sealing and ventilating ring group by forming the sealing circulation structure, so that the air flows through a small annular gap in the sealing and ventilating ring group, thereby achieving the effects of blocking lubricating oil and preventing leakage
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic cross-sectional front view of a sealed vent structure according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional front view of the first and second packing rings of FIG. 1 shown connected;
FIG. 3 is a schematic left side view of the first sealing ring of FIG. 2;
FIG. 4 is an enlarged view of a portion of the first sealing ring of FIG. 2.
Description of the figures
10. A turbine shaft; 101. a mounting flange; 20. a support bearing; 30. a rear bearing seat; 301. a high pressure gas flow channel; 302. a turbine shaft cavity; 304. a bearing mounting cavity; 40. sealing the vent ring set; 401. a pressure regulating cavity; 41. a first sealing ring; 411. a first sealing barrel; 412. a first mounting plate; 4121. through the hole; 4122. a communicating hole; 4123. pulling out the hole; 4124. an air storage tank; 4125. an exhaust hole; 42. a second sealing ring; 421. a second sealing barrel; 422. a second mounting plate; 43. a first grate ring; 44. a second grate ring; 45. a graphite coating; 50. a turntable; 60. an air flow channel; 70. and (6) sealing the ring.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
Referring to fig. 1, a preferred embodiment of the present invention provides a sealed vent structure comprising: the turbine rotary shaft 10, the supporting bearing 20 installed on the turbine rotary shaft 10, the rear bearing seat 30 connected to the casing of the combustion chamber for installing the supporting bearing 20, the sealing and ventilating ring set 40 installed on the turbine rotary shaft 10 and fixed with the rear bearing seat 30, the rotary disc 50 connected to the output end of the turbine rotary shaft 10, the sealing ring 70 with one end connected to the rear bearing seat 30 and the other end sleeved outside the rotary disc 50 to form an annular air flow channel 60 between the rear bearing seat 30 and the rotary disc 50, and the pressure regulating and exhausting device (not shown) for regulating pressure and exhausting air. The sealing vent ring set 40 is located in the sealing ring 70, and the end surface abuts against the end surface of the rear bearing seat 30, and the sealing vent ring set 40 is communicated with the high-pressure airflow channel 301 and the airflow channel 60 in the rear bearing seat 30, so that the high-pressure airflow in the high-pressure airflow channel 301 is introduced into the airflow channel 60. The sealing vent ring set 40 is also communicated with the pressure-regulating exhaust device to regulate the pressure difference at two sides of the sealing vent ring set 40 under the action of the pressure-regulating exhaust device, so that high-pressure airflow enters the pressure-regulating exhaust device from the airflow channel 60 through the sealing vent ring set 40 to form sealed circulation, and then two coaxially arranged sealing structures in the sealing vent ring set 40 form two airtight structures to hermetically install the outlet of the bearing installation cavity 304 of the support bearing 20, so that the bearing installation cavity 304 is prevented from being communicated with the airflow channel 60.
When the sealing ventilation structure works, high-pressure airflow in a combustion chamber enters a high-pressure airflow flow channel 301 in a rear bearing seat 30 and then enters an airflow channel 60 through a sealing ventilation ring group 40, and part of the high-pressure airflow entering the airflow channel 60 cools a rotary disc 50 and working blade tenons through a gap between a sealing ring 70 and the outer peripheral wall of the rotary disc 50; another portion of the high pressure gas stream entering gas flow passage 60 passes through a central opening (not shown) in disk 50 to cool the disks of each stage behind disk 50; the rest part of the high-pressure airflow entering the airflow channel 60 enters the sealing ventilation ring group 40, and part of the airflow entering the sealing ventilation ring group 40 enters the pressure-regulating exhaust device to form a sealing circulation, so that two coaxially arranged sealing structures in the sealing ventilation ring group 40 form a sealing structure to seal and mount the outlet of the bearing mounting cavity 304 of the support bearing 20, and the bearing mounting cavity 304 is prevented from being communicated with the airflow channel 60; the rest part of the airflow entering the sealed vent ring group 40 enters the bearing installation cavity 304, passes through the support bearing 20, enters the turbine shaft cavity, and finally enters the pressure regulating exhaust device from the turbine shaft cavity.
In the sealing and ventilating structure, the pressure difference at two sides of the sealing and ventilating ring group 40 is adjusted by arranging the pressure regulating and exhausting device, so that high-pressure airflow enters the pressure regulating and exhausting device from the airflow channel 60 through the sealing and ventilating ring group 40 to form sealing circulation, and then two coaxially arranged sealing structures in the sealing and ventilating ring group 40 form two air sealing structures, the sealing effect of the sealing and ventilating ring group 40 is enhanced, and the purposes of blocking lubricating oil in the bearing installation cavity 304 and preventing the lubricating oil from leaking into the airflow channel 60 are achieved; the pressure difference between the two sides of the sealing vent ring set 40 can be adjusted through the pressure adjusting and exhausting device, so that the pressure of the bearing installation cavity 304 between the sealing vent ring set 40 and the supporting bearing 20 can be adjusted, excessive foam of lubricating oil in the turbine shaft cavity 302 and the bearing installation cavity 304 and the removal of the lubricating oil film at the supporting bearing 20 are prevented from being easily caused by too large pressure of sealing airflow in the bearing installation cavity 304, and the too large pressure difference between the two sides of the sealing vent ring set 40 caused by too small pressure of sealing airflow in the bearing installation cavity 304 is prevented from further influencing the sealing effect of the sealing vent ring set 40; the sealing and ventilating structure has a simple structure and good effect, and ensures the air pressure difference at the front side and the rear side of the sealing and ventilating ring group 40 by forming a sealing circulation structure, so that air flows through a small annular gap in the sealing and ventilating ring group 40, thereby achieving the effects of blocking lubricating oil and preventing leakage.
Optionally, as shown in fig. 1 and 2, the seal vent ring set 40 includes a first seal ring 41, a second seal ring 42, a first grate ring 43 disposed in cooperation with the first seal ring 41, and a second grate ring 44 disposed in cooperation with the second seal ring 42. The first and second tooth rings 43 and 44 are axially mounted on the turbine rotating shaft 10, and the second tooth ring 44 is partially sleeved outside the first tooth ring 43, a first end of the first tooth ring 43 abuts against the support bearing 20, a second end of the first tooth ring 43 abuts against a first end of the second tooth ring 44, and a second end of the second tooth ring 44 abuts against a mounting flange 101 for mounting the rotating disk 50 on the turbine rotating shaft 10. First ring 41 that seals is located first comb ring 43 cover and the terminal surface leans on the terminal surface of rear bearing seat 30, and first ring 41 that seals is used for forming first airtight structure with first comb ring 43, and second ring 42 that seals just links to each other with first ring 41 coaxial arrangement that seals in order to form the pressure regulating chamber 401 with pressure regulating exhaust apparatus intercommunication between the two, and pressure regulating chamber 401 communicates with air flow channel 60 and bearing installation cavity 304, and second ring 42 that seals is used for forming second way air seal structure with second comb ring 44. During operation, part of high-pressure air in the air flow passage 60 enters the pressure regulating cavity 401 through a gap between the second sealing ring 42 and the second labyrinth ring 44 to form sealed air flow, the sealed air flow in the pressure regulating cavity 401 enters the pressure regulating exhaust device again to regulate the sealing pressure of the sealed air flow in the pressure regulating cavity 401 under the action of the pressure regulating exhaust device, the rest sealed air flow in the pressure regulating cavity 401 enters the bearing installation cavity 304 through a gap between the first sealing ring 41 and the first labyrinth ring 43, the sealed air flow in the bearing installation cavity 304 passes through the support bearing 20 to form oil mist to enter the turbine shaft cavity 302, the oil mist in the turbine shaft cavity 302 flows into the oil mist separator through the guide pipe, the oil mist separator separates the oil mist into lubricating oil and air, the lubricating oil leaks into the inner cavity of the accessory casing, and the air is discharged into the exhaust device through the guide pipe and the elbow pipe.
In this alternative embodiment, as shown in fig. 1 and fig. 2, the first sealing ring 41 includes a first sealing cylinder 411 in a hollow cylinder shape and a first annular mounting plate 412 connected to an outer annular wall of the first sealing cylinder 411, the first mounting plate 412 is clamped in a stop groove on an end surface of the rear bearing block 30, and the first sealing cylinder 411 is sleeved on the first comb tooth ring 43. The second sealing ring 42 includes a hollow cylindrical second sealing cylinder 421 and a second mounting plate 422 connected to the outer annular wall of the second sealing cylinder 421 and having an annular shape, the end surface of the second mounting plate 422 is fixedly connected to the end surface of the first mounting plate 412 to form a pressure regulating cavity 401 therebetween, and the second sealing cylinder 421 is sleeved outside the first sealing cylinder 411 and is sleeved on the second comb tooth ring 44. In this embodiment, the first sealing ring 41 and the second sealing ring 42 are both integrally formed structures, which is beneficial to enhancing the structural strength of the first sealing ring 41 and the second sealing ring 42, and is convenient for manufacturing the first sealing ring 41 and the second sealing ring 42. The end face of the second mounting plate 422 is welded and fixed to the end face of the first mounting plate 412, so that the sealing vent ring set 40 can be mounted and positioned conveniently. In the processing process, the single piece of the first sealing ring 41 and the single piece of the second sealing ring 42 are respectively processed, and then the two groups of the first sealing ring and the second sealing ring are welded into an assembly.
Preferably, as shown in fig. 2 and 4, the inner walls of the first sealing cylinder 411 and the second sealing cylinder 421 are milled with axially extending spiral grooves and then knurled. The inner walls of the first sealing cylinder 411 and the second sealing cylinder 421 are coated with a graphite coating 45. In practical processing, in order to reduce the sealing gaps between the first sealing barrel 411 and the first comb-tooth ring 43 and between the second sealing barrel 421 and the second comb-tooth ring 44 and avoid the situation that the matrix metal on the inner peripheral wall of the sealing barrel is scraped by the comb teeth on the comb-tooth ring during working, the graphite coating 45 is respectively coated on the inner walls of the first sealing barrel 411 and the second sealing barrel 421, and before the graphite coating 45 is coated, spiral grooves extending along the axial direction are lathed on the inner walls of the first sealing barrel 411 and the second sealing barrel 421 and then knurled, so that the contact area and the contact surface roughness with the graphite coating 45 are increased, the metal matrix of the graphite coating 45 and the first sealing barrel 411 and the second sealing barrel 421 is firmly combined, and the graphite coating is prevented from dropping blocks.
Preferably, as shown in fig. 1, the gap between the graphite coating 45 on the first sealing cylinder 411 and the outer annular surface of the first grate ring 43 is 0.05mm to 0.095 mm. The clearance between the graphite coating 45 on the second sealing cylinder 421 and the outer annular surface of the second grate ring 44 is 0.05 mm-0.095 mm. Gaps between the graphite coating 45 on the two sealing cylinders and the outer ring surface of the labyrinth ring are 0.05 mm-0.095 mm, if the gaps are small, the gaps between the graphite coating on the sealing cylinders and the outer ring surface of the labyrinth ring disappear under the cold condition after the engine is in test run due to a small difference between the sinking of the rotor and the initial assembly state of the rotor, and further abnormal sound is generated between the rotor and the stator due to contact friction, and the normal use of the engine is influenced.
In this alternative embodiment, as shown in fig. 1 and 3, the first mounting plate 412 is provided with a plurality of through holes 4121 and communication holes 4122. The through holes 4121 are respectively matched with the mounting holes on the end surface of the rear bearing seat 30, and the sealed vent ring set 40 is detachably connected with the rear bearing seat 30 through a connecting piece penetrating through the through holes 4121 and the correspondingly arranged mounting holes. The plurality of communication holes 4122 are provided corresponding to the plurality of vent holes on the end surface of the rear bearing housing 30, respectively, so that the high-pressure air flow in the high-pressure air flow passage 301 passes through the vent holes and the communication holes 4122 and then enters the air flow passage 60. The sealing ventilating ring group 40 is positioned through a rabbet groove on the rear bearing seat 30 of the combustion chamber casing, and is detachably fixed with the rear bearing seat 30 by adopting connecting pieces such as screws, bolts and the like, the positioning and fixing method has high centering precision, and the problems of abnormal noise, vibration, poor sealing effect and the like of an engine caused by non-uniform sealing clearance due to low centering precision can be avoided.
Preferably, as shown in fig. 3, a plurality of passing holes 4121 are provided at regular intervals in the circumferential direction of the first mounting plate 412. The plurality of communication holes 4122 are uniformly spaced along the circumferential direction of the first mounting plate 412, the through holes 4121 and the communication holes 4122 are positioned on the same circle of the first mounting plate 412, and the through holes 4121 and the communication holes 4122 are arranged in a staggered manner, so that the arrangement manner of the through holes 4121 and the communication holes 4122 is beneficial to processing and preparing the first sealing ring 41.
In this alternative embodiment, as shown in fig. 3, the first mounting plate 412 is further provided with a plurality of through holes 4123, and the plurality of holes 4123 are uniformly arranged along the circumferential direction of the first mounting plate 412 at intervals. Because during assembly, the assembly joint surface of the first sealing ring 41 is coated with sealant, so that the disassembly is very difficult, and the first mounting plate 412 is provided with a plurality of through pulling-out holes 4123 which are used as pulling-out holes for decomposing the first sealing ring 41, so that the first sealing ring 41 can be quickly and labor-saving pulled out and disassembled.
In this alternative embodiment, as shown in fig. 1 and 3, an inward concave and arc air storage groove 4124 is provided on the abutting surface of the first mounting plate 412 facing the rear bearing seat 30, and a plurality of air discharge holes 4125 penetrating through the first mounting plate 412 are provided at the bottom of the air storage groove 4124. The air storage groove 4124 is communicated with a pressure regulating exhaust device, the exhaust hole 4125 is communicated with the pressure regulating cavity 401, so that the sealed air flow in the pressure regulating cavity 401 enters the pressure regulating exhaust device to be exhausted after passing through the exhaust hole 4125 and the air storage groove 4124, and the pressure of the sealed air flow in the pressure regulating cavity 401 is also regulated by the pressure regulating exhaust device. In this embodiment, the air storage groove 4124 is disposed in the range of 90 ° on the first mounting plate 412, and 13 exhaust holes 4125 with a diameter of 6mm are uniformly distributed in the air storage groove 4124, so that the air in the pressure regulating chamber 401 is rapidly exhausted from the exhaust holes 4125 to the air storage groove 4124.
Further, the pressure-regulating exhaust means includes a pipe communicating with the air reservoir 4124, a replaceable pressure-regulating pad communicating with the pipe, an exhaust pipe communicating with a pressure-regulating hole in the pressure-regulating pad, and an exhaust member communicating with the exhaust pipe to discharge an air flow in the exhaust pipe to the outside. The pressure regulating pad is detachably arranged in a pressure regulating port of the combustion chamber casing.
During operation, air in the airflow channel 60 enters the pressure regulating cavity 401 through a sealing gap between the second sealing ring 42 and the second labyrinth ring 44, and the air in the pressure regulating cavity 401 is divided into two paths: one path reaches the air storage tank 4124 through the exhaust hole 4125, is guided to the pressure regulating port through the guide pipe and is exhausted into the exhaust component through the exhaust pipe; a pressure regulating pad is arranged on the joint surface of the conduit and the pressure regulating port, a pressure regulating hole is formed in the pressure regulating pad, the pressure regulating pad is divided into eight different groups according to the aperture of the pressure regulating hole, in order to regulate the pressure of the pressure regulating cavity 401, namely the sealed air of the engine, the air leading-out flow can be controlled by replacing the pressure regulating pad group, the air pressure of the pressure regulating cavity 401 is further controlled, the air pressure difference of the front and the back of the sealed ventilation ring group 40 is kept, and the sealing effect is achieved; the selection of each group of pressure regulating pads is determined according to the sealing condition; the air storage groove 4124 can store a small amount of air, and outward leakage of the compressed air for sealing is reduced as much as possible, so that the pressure of the pressure regulating cavity 401 is controlled, and sealing lubrication is achieved. The other path of air in the pressure regulating cavity 401 passes through a gap between the first sealing ring 41 and the first comb tooth ring 43 to seal lubricating oil, the working air passes through the supporting bearing 20 to form oil mist to be processed in the turbine shaft cavity 302, the oil mist in the turbine shaft cavity 302 flows into an oil mist separator through a guide pipe, the oil mist separator separates the oil mist into lubricating oil and air, the lubricating oil leaks into the inner cavity of the accessory casing, and the air is discharged into the pressure regulating and exhausting device through the guide pipe and a bent pipe.
During actual design, air in the pressure regulating cavity 401 needs to control certain pressure, and too high pressure easily causes excessive foam in lubricating oil and blows off a lubricating oil film; if the pressure is too low, the sealing effect of the sealing ventilating ring group 40 is not good, so a pressure regulating part for controlling or regulating the pressure is arranged in a sealing gas path of the sealing circulation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A sealed vent structure, comprising:
the device comprises a turbine rotating shaft (10), a supporting bearing (20) arranged on the turbine rotating shaft (10), a rear bearing seat (30) connected to a combustion chamber casing and used for mounting the supporting bearing (20), a sealing ventilating ring group (40) arranged on the turbine rotating shaft (10) and fixed with the rear bearing seat (30), a rotary disc (50) connected to the output end of the turbine rotating shaft (10), a sealing ring (70) with one end connected with the rear bearing seat (30) and the other end sleeved outside the rotary disc (50) so as to enclose an annular air flow channel (60) between the rear bearing seat (30) and the rotary disc (50), and a pressure regulating and exhausting device used for regulating pressure and exhausting;
the sealing and ventilating ring set (40) is positioned in the sealing ring (70) and the end face of the sealing and ventilating ring set abuts against the end face of the rear bearing seat (30), and the sealing and ventilating ring set (40) is communicated with a high-pressure airflow flow channel (301) in the rear bearing seat (30) and the airflow channel (60) so as to introduce high-pressure airflow in the high-pressure airflow flow channel (301) into the airflow channel (60);
the sealing and ventilating ring set (40) is also communicated with the pressure regulating and exhausting device so as to regulate the pressure difference on two sides of the sealing and ventilating ring set (40) under the action of the pressure regulating and exhausting device, so that high-pressure airflow enters the pressure regulating and exhausting device from the airflow channel (60) through the sealing and ventilating ring set (40) to form a sealing circulation, and further two coaxially arranged sealing structures in the sealing and ventilating ring set (40) form a sealing structure so as to seal an outlet of a bearing installation cavity (304) for installing the supporting bearing (20) and prevent the bearing installation cavity (304) from being communicated with the airflow channel (60);
the sealing and ventilating ring group (40) comprises a first sealing ring (41), a second sealing ring (42), a first comb tooth ring (43) matched with the first sealing ring (41) and a second comb tooth ring (44) matched with the second sealing ring (42);
the first and second grate ring (43, 44) are axially mounted on the turbine rotating shaft (10) and the second grate ring (44) is partially sleeved outside the first grate ring (43), a first end of the first grate ring (43) abuts against the support bearing (20), a second end of the first grate ring (43) abuts against a first end of the second grate ring (44), and a second end of the second grate ring (44) abuts against a mounting flange (101) on the turbine rotating shaft (10) for mounting the rotating disc (50);
first ring (41) of obturating cover is located just the terminal surface supports on the first comb ring (43) and leans on the terminal surface of rear bearing seat (30), first ring (41) of obturating be used for with first comb ring (43) forms first airtight structure, second ring (42) of obturating with first ring (41) of obturating coaxial setting and link to each other in order between the two form with pressure regulating cavity (401) of pressure regulating exhaust apparatus intercommunication, pressure regulating cavity (401) with air flow channel (60) reach bearing installation cavity (304) intercommunication, second ring (42) of obturating be used for with second comb ring (44) forms second way air tight structure.
2. The seal vent of claim 1,
the first sealing ring (41) comprises a first sealing barrel (411) in a hollow barrel shape and a first mounting disc (412) which is connected with the outer ring wall of the first sealing barrel (411) and is in an annular shape, the first mounting disc (412) is clamped in a stop groove on the end face of the rear bearing seat (30), and the first sealing barrel (411) is sleeved on the first comb tooth ring (43);
the second sealing ring (42) comprises a hollow cylindrical second sealing cylinder (421) and an annular second mounting disc (422) connected with the outer annular wall of the second sealing cylinder (421), the end face of the second mounting disc (422) is fixedly connected with the end face of the first mounting disc (412) to form the pressure regulating cavity (401) between the second sealing cylinder and the first mounting disc, and the second sealing cylinder (421) is sleeved outside the first sealing cylinder (411) and sleeved on the second comb tooth ring (44).
3. The seal vent of claim 2,
the inner walls of the first sealing cylinder (411) and the second sealing cylinder (421) are provided with spiral grooves extending along the axial direction in a lathing mode and then are knurled;
the inner walls of the first sealing cylinder (411) and the second sealing cylinder (421) are coated with graphite coatings (45).
4. The seal vent of claim 3,
the clearance between the graphite coating (45) on the first sealing barrel (411) and the outer ring surface of the first comb tooth ring (43) is 0.05-0.095 mm;
the clearance between the graphite coating (45) on the second sealing cylinder (421) and the outer ring surface of the second grate ring (44) is 0.05-0.095 mm.
5. The seal vent of claim 2,
the first mounting plate (412) is provided with a plurality of through holes (4121) and communication holes (4122);
the through holes (4121) are respectively matched with the mounting holes on the end surface of the rear bearing seat (30), and the sealing vent ring group (40) is detachably connected with the rear bearing seat (30) through a connecting piece which penetrates through the through holes (4121) and the correspondingly arranged mounting holes;
the communication holes (4122) are respectively arranged corresponding to the vent holes on the end surface of the rear bearing seat (30), so that the high-pressure airflow in the high-pressure airflow channel (301) enters the airflow channel (60) after passing through the vent holes and the communication holes (4122).
6. The seal vent structure of claim 5,
the plurality of through holes (4121) are arranged at regular intervals in the circumferential direction of the first mounting plate (412);
the plurality of communication holes (4122) are uniformly spaced in the circumferential direction of the first mounting plate (412), the passage holes (4121) and the communication holes (4122) are located on the same circle of the first mounting plate (412), and the passage holes (4121) and the communication holes (4122) are alternately arranged.
7. The seal vent of claim 2,
the first mounting disc (412) is further provided with a plurality of through pulling and unloading holes (4123), and the pulling and unloading holes (4123) are uniformly distributed at intervals along the circumferential direction of the first mounting disc (412).
8. The seal vent of claim 2,
an inwards concave and arc-shaped air storage groove (4124) is formed in the abutting surface of the first mounting plate (412) facing the rear bearing seat (30), and a plurality of exhaust holes (4125) penetrating through the first mounting plate (412) are formed in the bottom of the air storage groove (4124);
the air storage groove (4124) is communicated with the pressure-regulating exhaust device, the exhaust hole (4125) is communicated with the pressure-regulating cavity (401), so that the sealed air flow in the pressure-regulating cavity (401) enters the pressure-regulating exhaust device to be exhausted after passing through the exhaust hole (4125) and the air storage groove (4124), and the pressure of the sealed air flow in the pressure-regulating cavity (401) is also regulated by the pressure-regulating exhaust device.
9. The seal vent of claim 8,
the pressure regulating and exhausting device comprises a guide pipe communicated with the air storage tank (4124), a replaceable pressure regulating pad communicated with the guide pipe, an exhaust pipe communicated with a pressure regulating hole in the pressure regulating pad, and an exhaust component communicated with the exhaust pipe to exhaust airflow in the exhaust pipe outwards;
the pressure regulating pad is detachably arranged in a pressure regulating port of the combustion chamber casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910698329.2A CN110500141B (en) | 2019-07-31 | 2019-07-31 | Sealing and ventilating structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910698329.2A CN110500141B (en) | 2019-07-31 | 2019-07-31 | Sealing and ventilating structure |
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| CN110500141A CN110500141A (en) | 2019-11-26 |
| CN110500141B true CN110500141B (en) | 2021-11-30 |
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| CN113309616B (en) * | 2021-05-27 | 2022-09-16 | 中国航发南方工业有限公司 | Sealing structure for bearing of compressor |
Citations (1)
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| CN2679366Y (en) * | 2004-03-16 | 2005-02-16 | 沈阳黎明航空发动机(集团)有限责任公司 | Dual-layer bar grate densification device |
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| JP4375883B2 (en) * | 2000-06-02 | 2009-12-02 | 本田技研工業株式会社 | Seal air supply system for gas turbine engine bearings |
| US10215098B2 (en) * | 2015-01-22 | 2019-02-26 | United Technologies Corporation | Bearing compartment seal |
| US10196986B2 (en) * | 2015-09-04 | 2019-02-05 | General Electric Company | Hydrodynamic seals in bearing compartments of gas turbine engines |
| CN206581990U (en) * | 2016-12-30 | 2017-10-24 | 中国航发商用航空发动机有限责任公司 | The system of obturaging of prewhirling of aero-engine |
| CN107269396B (en) * | 2017-08-17 | 2019-02-15 | 中国科学院工程热物理研究所 | A kind of achievable bearing is total to the seal structure that chamber and bearing exocoel are pressed |
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| CN2679366Y (en) * | 2004-03-16 | 2005-02-16 | 沈阳黎明航空发动机(集团)有限责任公司 | Dual-layer bar grate densification device |
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| 篦齿封严结构气弹稳定性数值分析;王能茂等;《航空动力学报》;20180521(第05期);全文 * |
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